US2591308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light valve system
Assignee: Individual
•
Filing: 1950-10-20
•
Granted: 1952-04-01
•
Expires: 1970-10-20
Abstract
No abstract record available.
Inventors
- 👤 Frank K Singiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:19
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/74; H04N5/7416; H04N5/7425
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2025143A
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US2163918A
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USRE22115E
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US2281280A
Cited
US2315113A
Cited
US2302124A
Cited
US2432908A
Cited
US2495697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |